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Intermolecular Vibrations in Aprotic Molecular Liquids and Ionic Liquids

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Molecular Basics of Liquids and Liquid-Based Materials

Part of the book series: Physical Chemistry in Action ((PCIA))

Abstract

Intermolecular dynamics in liquids and solutions involves the collective orientational motion of solvent/liquid molecules and intermolecular vibrations. These motions significantly influence the elementary reaction processes in solution. Therefore, the intermolecular dynamics of liquids and solutions is among the most important basic themes in chemistry. The intermolecular dynamics in liquids and solutions occurs in the time domain of approximately tens of femtoseconds (fs) to hundreds of picoseconds (about 103 to 10−1 cm−1 in the frequency domain with the wavenumber unit). Thus, for a detailed understanding of intermolecular vibrations and collective orientational motion in liquids and solutions, observing molecular motions in the low-frequency region (approximately 200 cm−1 or less) is necessary. Dynamic Raman-induced Kerr effect spectroscopy (RIKES) using a fs laser can obtain low-frequency spectra without Rayleigh scattering. In this chapter, the subject of intermolecular vibrations in molecular liquids (MLs) and ionic liquids (ILs) studied by fs-RIKES is overviewed. Studies on the low-frequency spectra of liquids by complementary methods, molecular dynamics (MD) simulations, and THz time-domain spectroscopy (THz-TDS) or far-infrared (far-IR) spectroscopy are also outlined in this chapter.

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Acknowledgments

The author would like to thank colleagues Dr. James Wishart, Ms. Sharon Ramati (Brookhaven National Laboratory), Dr. Tomotsumi Fujisawa (Chiba University, now Saga University), Mr. Hiroki Fukazawa, Mr. Tatsuya Kato, Dr. Shohei Kakinuma, Mr. Hironori Matsuzaki, Mr. Kotaro Takahashi, Mr. Akito Tago, Mr. Hocheon Jeong, and Mr. Masatoshi Ando (Chiba University). The studies conducted in the author’s group discussed in this chapter were supported by JSPS KAKENHI (19559001, 21685001, 15 K05377, and 19 K05382), the JGC-S Scholarship Foundation, the Izumi Science and Technology Foundation, the Iwatani Naoji Foundation, the Shimadzu Science Foundation, and the Takahashi Industrial and Economic Research Foundation.

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  1. Department of Chemistry, Chiba University, Chiba, Japan

    Hideaki Shirota

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  1. Hideaki Shirota
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Correspondence to Hideaki Shirota .

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  1. Meijo University, Nagoya, Japan

    Katsura Nishiyama

  2. Nagoya University, Nagoya, Japan

    Tsuyoshi Yamaguchi

  3. Saga University, Saga, Japan

    Toshiyuki Takamuku

  4. Kyushu University, Fukuoka, Japan

    Norio Yoshida

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Shirota, H. (2021). Intermolecular Vibrations in Aprotic Molecular Liquids and Ionic Liquids. In: Nishiyama, K., Yamaguchi, T., Takamuku, T., Yoshida, N. (eds) Molecular Basics of Liquids and Liquid-Based Materials. Physical Chemistry in Action. Springer, Singapore. https://doi.org/10.1007/978-981-16-5395-7_7

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